Check in codegen test expectations.

test/codegen/expect/language/tree_shake_typed_selector_test.js

Index: test/codegen/expect/language/tree_shake_typed_selector_test.js
diff --git a/test/codegen/expect/language/tree_shake_typed_selector_test.js b/test/codegen/expect/language/tree_shake_typed_selector_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..4ab4eba1394110b865ac21c00bca2fd357e54b33
--- /dev/null
+++ b/test/codegen/expect/language/tree_shake_typed_selector_test.js
@@ -0,0 +1,44 @@
+dart_library.library('language/tree_shake_typed_selector_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__tree_shake_typed_selector_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const tree_shake_typed_selector_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  tree_shake_typed_selector_test.A = class A extends core.Object {
+    static new() {
+      return new tree_shake_typed_selector_test.B();
+    }
+    foo() {
+      return 0;
+    }
+  };
+  dart.setSignature(tree_shake_typed_selector_test.A, {
+    constructors: () => ({new: dart.definiteFunctionType(tree_shake_typed_selector_test.A, [])}),
+    methods: () => ({foo: dart.definiteFunctionType(dart.dynamic, [])})
+  });
+  tree_shake_typed_selector_test.B = class B extends core.Object {
+    foo() {
+      return 42;
+    }
+  };
+  tree_shake_typed_selector_test.B[dart.implements] = () => [tree_shake_typed_selector_test.A];
+  dart.setSignature(tree_shake_typed_selector_test.B, {
+    methods: () => ({foo: dart.definiteFunctionType(dart.dynamic, [])})
+  });
+  tree_shake_typed_selector_test.main = function() {
+    let a = tree_shake_typed_selector_test.A.new();
+    if (tree_shake_typed_selector_test.A.is(a)) {
+      expect$.Expect.equals(42, a.foo());
+    } else {
+      expect$.Expect.fail('Should not be here');
+    }
+  };
+  dart.fn(tree_shake_typed_selector_test.main, VoidTodynamic());
+  // Exports:
+  exports.tree_shake_typed_selector_test = tree_shake_typed_selector_test;
+});